Hydraulic press.



No. 841,150. PATENTED JAN. 15, 1907.

F. H. HOBBRG & D. W. HUDSON.

HYDRAULIC PRESS.

APPLICATION FILED MAR.2B, 1906.

3 SHEETS-SHEET 1.

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' A TTOR/VE-KY ,150. PATENTED JAN. 15, 1907.

F. H. HOBERG & D. W. HUDSON.

HYDRAULIC PRESS.

APPLICATION FILED MAR. 28, 1906.

3 SHEETS-SHEET 3- UNITED STATES FRANK HENRY HOB'ERG AND DAV-ID WILLIAM HUDSON, OF GREEN BAY,

PATENT OFFICE.

WISCONSIN.

:HYD-RAU UIC PRESS.

No..s4-1,150.

Patented Jan. 15, 1907.

Application'filed March 28, 1906. Serial No. 308,421.

To all whom/ it may concern:

Be it known that we, FRANK HENRY Ho- BERG and DAVID WILLIAM HUDSON, citizens of the United States, residing at Green Bay, county of Brown, and State ofWisconsin,

have invented new and useful Improvements in Hydraulic Presses, of which the following is a specification. Y Our inventlon relates to improvements in of paper preparatory to tying or wrapping them in bundles for shipment.

In the following description reference is had to the accompanying drawings, in which Figure 1 is a side-view of our invention, drawn partially in vertical section, exposing the hydraulic plunger and the storage-chamber. Fig. 2is avertical sectional view drawn on the axis ofthe pump-cylinder. Fig. 3 is a horizontal sectional view drawn on line y y of Fig. 2. Fig. 4 is a partial plan view of the lower portion of the machine, drawn on line a: a: of Fig. 1, with the platen removed. Fig. '5 is a detail sectional view of the relief-valve.

Like parts :are identified by the same reference characters throughout the several views.

A base 1 supports an upright cylinder 2 and a'hollow goosenecked standard 3, which forms the frame of the press, and also provides a chamber 4 for the reception of'oil or other fluid 5. A plunger 6 ,"provided with a cup-leather piston 7, operates'in the cylinder 2 and carries a table or platen 8, which is lifted on the compression-stroke toward the stationary plate 9, carried by the upper portion of the standard.

10 is a pump-cylinder, to the lower end of which a duct 11 leads from the storagechamber through a horizontal bed-plate12 and vertically at 13 to the lower end of the cylinder 15. A ball-valve 15 is located at the end of the cylinder 10 and fitted to a concave seat at the mouth of the passage 13.

, ered to a vertical passage 22, leading downwardly into the base 1 and along the base to the bottom of the cylinder 2, underneath the cup-leather piston 7. The valve is provided with a stem 22, guided in a suitable socket in a screw-threaded nut 24, the pressure of the valve upon this seat being regulated by this nutand a spring 32 in the upper end of the valve-stem socket.

The liquid in the cylinder 2 is permitted to exhaust after the compressing operation through a passage 25 in the base 1, which sage 26, extending upwardly in the pumpcasting, and then'outwardly at 27 and downwardly at 28 'to'a passage 29, leading to the passage 11 in the bed-plate 12. A valvestem '30, screw-threaded at 31, controls the How of the liquid through the horizontal portion 27 and through the exhaust-passage. Where our invention is applied to lettercopying presses, the pump-piston 10 is preferably operated by means of a lever 39, the latter being pivoted at 40 to a post 41, mounted on the bed-plate 12. The lever 35 is provided with a removable extension 42, adapted to fitinto a socket in the permanent portion of the lever, as indicated by dotted lines in Fig. 1. The press'may, however, be operated-by any other form of power,' and we preferably provide a relief-valve controlling a passage 46,1eading from the cylinder 2 to the chamber 4. "This valve is arranged to open with'the pressure and is provided with a stem 48, connected with a lever '49, and carries an adjustable weight 50. Whenever the pressure is suflicient on the valve to lift the Weight 50, the liquid escapes through the passage 46 into the chamber 4, and thus limits the pressure which can be exerted on the platen 8.

It will be observed that the cylinder 2 is beveled outwardly at its upper edge, as indicated at 55, and forms an annular channel around the plunger 6, adapted to receive any liquid which may escape past the cupleather 7. The liquid in the channel is permitted to flow by gravity back to the chamber 4 through a duct 56.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In a device of the described class, the l combination with a base; of a hollow goosepassage25 communicates with a vertical pas- IOC necked standard; a stationary plate carried said exhaust-passage having a raised hori zontal portion provided with a manually-controlled valve for regulating the flow of liquid into said passage.

2. In a device of the described class, the combination of a base; a hollow standard provided with a press-cylinder, mounted on said base; a bed-plate provided with a pumpcylinder, mounted on the base; valved passages communicating through the pump-cylinder between the standard and press-cylinder; and other passages leading from the press-cylinder to the standard independently of the pump-cylinder and provided with a manually-controlled valve.

3. In a device of the described class, the combination of a base; a hollow standard provided with a press-cylinder, mounted on said base; a bed-plate provided with a pump cylinder, mounted on the base; valved passages communicating through the pump-cylinder between the standard and press-cylinder, and other passages leading from the press-cylinder to the standard independently of the pump-cylinder and provided with a manually-controlled valve; said last-mentioned passages being also arranged to lead in part through the base and in part through the bed-plate of the pump-cylinder.

4. In a device of the described class, the combination with a base having a hollow standard provided with a hydraulic-press cylinder and press mounted thereon; of a set of castings containing a pump-cylinder and cooperating with the base to form passages communicating between the standard and der in one direction; one of said passages being independent of the pump-cylinder and provided with a raised horizontal portion; and a manually-operated valve controlling the passage of fluid through the raised portion. K

5. In a device of the described class,'the combination of a base; a hollow standard provided with a press-cylinder, mounted on said base; a bed-plate provided with a pump cylinder, mounted on the base; valved passages communicating through thepump-cylinder; and other passages leading from the press-cylinder to the standard independently of the pump-cylinder and provided with a manually-controlled valve; said pump having a piston, a manually-operated lever connected therewith and a removable extension fitted to a socket in said lever.

6. In a device of the described class, the Y controlled valve; together with a relief pas- I sage leading from the press-cylinder to the standard; a valve controlling said passage; a lever connected with the valve; and an ad justable weight on said lever; said last-mentioned valve being arranged toopen with the pressure of the liquid in the press-cylinder and against the pressureof the weight.

In testimony whereof we afiiX our signatures in the presence of two witnesses.

FRANK HENRY HOBERG. DAVID WILLIAM HUDSON.

Witnesses Gno. H AUDE, ALEX. SHARP. 

